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diff --git a/servers/slapd/back-mdb/back-mdb.h b/servers/slapd/back-mdb/back-mdb.h
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+/* back-mdb.h - mdb back-end header file */
+/* $OpenLDAP$ */
+/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
+ *
+ * Copyright 2000-2018 The OpenLDAP Foundation.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted only as authorized by the OpenLDAP
+ * Public License.
+ *
+ * A copy of this license is available in the file LICENSE in the
+ * top-level directory of the distribution or, alternatively, at
+ * <http://www.OpenLDAP.org/license.html>.
+ */
+
+#ifndef _BACK_MDB_H_
+#define _BACK_MDB_H_
+
+#include <portable.h>
+#include "slap.h"
+#include "lmdb.h"
+
+LDAP_BEGIN_DECL
+
+#undef MDB_TOOL_IDL_CACHING /* currently broken */
+
+#define DN_BASE_PREFIX SLAP_INDEX_EQUALITY_PREFIX
+#define DN_ONE_PREFIX '%'
+#define DN_SUBTREE_PREFIX '@'
+
+#define MDB_AD2ID 0
+#define MDB_DN2ID 1
+#define MDB_ID2ENTRY 2
+#define MDB_NDB 3
+
+/* The default search IDL stack cache depth */
+#define DEFAULT_SEARCH_STACK_DEPTH 16
+
+/* The minimum we can function with */
+#define MINIMUM_SEARCH_STACK_DEPTH 8
+
+#define MDB_INDICES 128
+
+#define MDB_MAXADS 65536
+
+/* Default to 10MB max */
+#define DEFAULT_MAPSIZE (10*1048576)
+
+/* Most users will never see this */
+#define DEFAULT_RTXN_SIZE 10000
+
+#ifdef LDAP_DEVEL
+#define MDB_MONITOR_IDX
+#endif /* LDAP_DEVEL */
+
+typedef struct mdb_monitor_t {
+ void *mdm_cb;
+ struct berval mdm_ndn;
+} mdb_monitor_t;
+
+/* From ldap_rq.h */
+struct re_s;
+
+struct mdb_info {
+ MDB_env *mi_dbenv;
+
+ /* DB_ENV parameters */
+ /* The DB_ENV can be tuned via DB_CONFIG */
+ char *mi_dbenv_home;
+ uint32_t mi_dbenv_flags;
+ int mi_dbenv_mode;
+
+ size_t mi_mapsize;
+ ID mi_nextid;
+
+ slap_mask_t mi_defaultmask;
+ int mi_nattrs;
+ struct mdb_attrinfo **mi_attrs;
+ void *mi_search_stack;
+ int mi_search_stack_depth;
+ int mi_readers;
+
+ uint32_t mi_rtxn_size;
+ int mi_txn_cp;
+ uint32_t mi_txn_cp_min;
+ uint32_t mi_txn_cp_kbyte;
+ struct re_s *mi_txn_cp_task;
+ struct re_s *mi_index_task;
+
+ mdb_monitor_t mi_monitor;
+
+#ifdef MDB_MONITOR_IDX
+ ldap_pvt_thread_mutex_t mi_idx_mutex;
+ Avlnode *mi_idx;
+#endif /* MDB_MONITOR_IDX */
+
+ int mi_flags;
+#define MDB_IS_OPEN 0x01
+#define MDB_OPEN_INDEX 0x02
+#define MDB_DEL_INDEX 0x08
+#define MDB_RE_OPEN 0x10
+#define MDB_NEED_UPGRADE 0x20
+
+ int mi_numads;
+
+ MDB_dbi mi_dbis[MDB_NDB];
+ AttributeDescription *mi_ads[MDB_MAXADS];
+ int mi_adxs[MDB_MAXADS];
+};
+
+#define mi_id2entry mi_dbis[MDB_ID2ENTRY]
+#define mi_dn2id mi_dbis[MDB_DN2ID]
+#define mi_ad2id mi_dbis[MDB_AD2ID]
+
+typedef struct mdb_op_info {
+ OpExtra moi_oe;
+ MDB_txn* moi_txn;
+ int moi_ref;
+ char moi_flag;
+} mdb_op_info;
+#define MOI_READER 0x01
+#define MOI_FREEIT 0x02
+
+/* Copy an ID "src" to pointer "dst" in big-endian byte order */
+#define MDB_ID2DISK( src, dst ) \
+ do { int i0; ID tmp; unsigned char *_p; \
+ tmp = (src); _p = (unsigned char *)(dst); \
+ for ( i0=sizeof(ID)-1; i0>=0; i0-- ) { \
+ _p[i0] = tmp & 0xff; tmp >>= 8; \
+ } \
+ } while(0)
+
+/* Copy a pointer "src" to a pointer "dst" from big-endian to native order */
+#define MDB_DISK2ID( src, dst ) \
+ do { unsigned i0; ID tmp = 0; unsigned char *_p; \
+ _p = (unsigned char *)(src); \
+ for ( i0=0; i0<sizeof(ID); i0++ ) { \
+ tmp <<= 8; tmp |= *_p++; \
+ } *(dst) = tmp; \
+ } while (0)
+
+LDAP_END_DECL
+
+/* for the cache of attribute information (which are indexed, etc.) */
+typedef struct mdb_attrinfo {
+ AttributeDescription *ai_desc; /* attribute description cn;lang-en */
+ slap_mask_t ai_indexmask; /* how the attr is indexed */
+ slap_mask_t ai_newmask; /* new settings to replace old mask */
+#ifdef LDAP_COMP_MATCH
+ ComponentReference* ai_cr; /*component indexing*/
+#endif
+ Avlnode *ai_root; /* for tools */
+ void *ai_flist; /* for tools */
+ void *ai_clist; /* for tools */
+ MDB_cursor *ai_cursor; /* for tools */
+ int ai_idx; /* position in AI array */
+ MDB_dbi ai_dbi;
+} AttrInfo;
+
+/* These flags must not clash with SLAP_INDEX flags or ops in slap.h! */
+#define MDB_INDEX_DELETING 0x8000U /* index is being modified */
+#define MDB_INDEX_UPDATE_OP 0x03 /* performing an index update */
+
+/* For slapindex to record which attrs in an entry belong to which
+ * index database
+ */
+typedef struct AttrList {
+ struct AttrList *next;
+ Attribute *attr;
+} AttrList;
+
+#ifndef CACHELINE
+#define CACHELINE 64
+#endif
+
+#if defined(__i386) || defined(__x86_64)
+#define MISALIGNED_OK 1
+#else
+#define ALIGNER (sizeof(size_t)-1)
+#endif
+
+typedef struct IndexRbody {
+ AttrInfo *ai;
+ AttrList *attrs;
+ void *tptr;
+ int i;
+} IndexRbody;
+
+typedef struct IndexRec {
+ union {
+ IndexRbody irb;
+#define ir_ai iru.irb.ai
+#define ir_attrs iru.irb.attrs
+#define ir_tptr iru.irb.tptr
+#define ir_i iru.irb.i
+ /* cache line alignment */
+ char pad[(sizeof(IndexRbody)+CACHELINE-1) & (!CACHELINE-1)];
+ } iru;
+} IndexRec;
+
+#define MAXRDNS SLAP_LDAPDN_MAXLEN/4
+
+#include "proto-mdb.h"
+
+#endif /* _BACK_MDB_H_ */